<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Promise封装</title>
</head>

<body>
    <script>
        //接口地址 https://api.apiopen.top/api/sentences
        const P = new Promise((resolve, reject) => {
            //1、创建对象
            const xhr = new XMLHttpRequest();
            //2、初始化
            xhr.open("GET", "https://api.apiopen.top/api/sentences");

            //3、发送
            xhr.send();
            //4.绑定事件，处理响应结果
            xhr.onreadystatechange = function () {
                //判断
                if (xhr.readyState === 4) {
                    //判断响应状态码 200 - 299
                    if (xhr.status >= 200 && xhr.status < 300) {
                        resolve(xhr.response);
                    } else {
                        reject(xhr.status);
                    }
                }
            };
        });

        P.then(value=>{
            console.log(value);
        },reason=>{
            console.log(reason);
        })

    </script>
</body>

</html>